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    <title>Document</title>
    <script>
        function Person(name, age , gender){
            this.name = name ;
            this.age = age ;
            this.gender = gender;
        }
        Person.prototype.toString = function(){
            return 'name:'+this.name  + ' age:'+this.age  + ' gender:' +this.gender;
        }
        var per = new Person('苏凉',21,'男');

        console.log(per.toString());
        console.log(per);
    </script>
</head>
<body>
    
</body>
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